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Implement decoding High Sierra directories.

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This commit is contained in:
Natalia Portillo
2019-07-20 01:42:01 +01:00
parent ea8411f641
commit 1d3a0eccbc
2 changed files with 44 additions and 4 deletions
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42
DiscImageChef.Filesystems/ISO9660/Dir.cs
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@@ -132,8 +132,46 @@ namespace DiscImageChef.Filesystems.ISO9660
Dictionary<string, DecodedDirectoryEntry> DecodeCdiDirectory(byte[] data) =>
throw new NotImplementedException();
Dictionary<string, DecodedDirectoryEntry> DecodeHighSierraDirectory(byte[] data) =>
throw new NotImplementedException();
Dictionary<string, DecodedDirectoryEntry> DecodeHighSierraDirectory(byte[] data)
{
Dictionary<string, DecodedDirectoryEntry> entries = new Dictionary<string, DecodedDirectoryEntry>();
int entryOff = 0;
while(entryOff + DirectoryRecordSize < data.Length)
{
HighSierraDirectoryRecord record =
Marshal.ByteArrayToStructureLittleEndian<HighSierraDirectoryRecord>(data, entryOff,
Marshal
.SizeOf<DirectoryRecord>());
if(record.length == 0) break;
// Special entries for current and parent directories, skip them
if(record.name_len == 1)
if(data[entryOff + DirectoryRecordSize] == 0 || data[entryOff + DirectoryRecordSize] == 1)
{
entryOff += record.length;
continue;
}
DecodedDirectoryEntry entry = new DecodedDirectoryEntry
{
Extent = record.size == 0 ? 0 : record.extent,
Size = record.size,
Flags = record.flags,
Interleave = record.interleave,
VolumeSequenceNumber = record.volume_sequence_number,
IsoFilename =
Encoding.ASCII.GetString(data, entryOff + DirectoryRecordSize, record.name_len)
};
if(!entries.ContainsKey(entry.IsoFilename)) entries.Add(entry.IsoFilename, entry);
entryOff += record.length;
}
return entries;
}
// TODO: Implement system area
Dictionary<string, DecodedDirectoryEntry> DecodeIsoDirectory(byte[] data)